EntityResolver

Resolves the external entity identified by the publicId and systemId parameters.

InputSource resolveEntity( String publicId, String systemId) 

Allows the application to resolve the external entity to a different InputSource. (http://www.test.org/test.dtd -> test.dtd)

import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;

public class LocalResolver implements EntityResolver 
  public InputSource resolveEntity( String publicId, String systemId) {
    if ( systemId.equals( "http://www.test.org/test.dtd")) {
      return new InputSource( "test.dtd");
    } else {
      return null;
    }
  }
}